氨氮废水处理过程中的好氧反硝化研究贾剑晖

贾剑晖(,353000)　　采用序批式反应器处理氨氮废水,试验结果验证了好氧反硝化的存在,好氧反硝化脱氮能力随混合液溶解氧浓度的提高而降低,当溶解氧浓度为0.5mg/L时,总氮去除率可达到66.0%。并结合理论分析,对好氧反硝化的机理进行了探讨。　氨氮　硝化　好氧反硝化　溶解氧　碳氮比:　TQ085　:　A　:　1008-5963(2004)02-0070-05ResearchontheOxophileDenitrifyingduringtheDisposaloftheWasteWaterofAmmonia-nitrogenJIAJianhui(Chemistry&EnvironmentalEngineeringDepartmentofNanpingTeachersCollege,Nanping,Fujian353000)Abstract　Thepaperadoptsthereactorofordertodisposethewastewaterofammonia-nitrogen.Theresultofthetestverifiestheexistoftheoxophiledenitrifying.Theabilityoftheoxophileden-itrifyingtode-nitrogenwilldeclineiftheconcentrationofthesolutionoxygeninthemixedliquidisincreased.Whentheconcentrationofthesolutionoxygenis0.5mg/L,theratiosofde-nitrogenwillbe66.0percent.Itstudiesthemechanismoftheoxophiledenitrifyingac-cordingtothetheoryanalysis.Keywords　ammonia-nitrogen　nitrification　oxophiledenitrifying　solutionoxygen　C-Nratio,。:,,,,,。,(),A/O。,,;,,。,,,,。,,,(Aero-bicdenitrification)[1～2]。30%[3]。,,。—70—　　:2004-03-01:(1975—),,,。232　　　　　　　　　　　　　　　　　　　　　　　　　　　Vol.23No.2　　20044　　　　　　JOURNALOFNANPINGTEACHERSCOLLEGE　　　　　Apr.2004　　1　1.1　,100mm,700mm,5L。12h,5,0.5h,3h,7h,1h,0.5h。28℃,3L(2L),25mL80d。1.2　,3,COD/N5.78、4.262.03(),1。表1　COD/N比值对硝化和除氮效果的影响COD/NCOD(mg/l)氨氮(mg/l)硝态氮(mg/l)进水出水去除率(%)进水出水去除率(%)进水出水总氮去除率(%)5.78346.626.7592.2859.920.299.7018.7968.614.26252.9618.5292.6859.360.299.7023.6060.212.03106.612.8687.9452.640.299.6027.9346.882　2.1　COD/N1:COD/N,,NH3-N100%(99%),COD90%,。COD/N,NO3--N18.79mg/L,23.6mg/L27.93mg/L。COD,NO3--N,,。(1COD/N=2.03),,,(46.88%)。,COD/N(2.03),。,,,,,,。,COD/N4,。2.2　图1　氮元素随时间变化,COD/N=5.78,1。1,3.5h(0.5h3h),7h10.5h。。,,;2h,2h。1,,;2h,,—71—:图2　处理过程中COD浓度变化情况,。,1COD/N,24.99%,17.16%3.92%。,,,,。COD,COD,,,2。2.3　COD400mg/L,NH3—N40mg/L,MLSS4000mg/L,TDO-100(DO)11h,DO4mg/L,2mg/L0.5mg/L,DO,3。图3　溶解氧对硝化反硝化效率的影响3,DO,11h,100%,NH3—N100%。,DO,TN35.9%、47.5%、66.0%。DO。,DO,DO,。,,DO,,。3　,,,、。3.1　,。,[4],DO(DO0.1mg/L)。。。80,。PseudomonasSpp、Alcaligenesfaecalis、ThiosphaeraPantotropha,[5-6]。,[6]。Robertson,ThiosphaeraPantotropha/(),(,),Pdy-P-hydroxybuty-rate(PHB)。—72—　20042,DO,[5]。,,()[6]。3.2　。;。,:NH3()※H2N-NH2()※NH2-OH()※N2()※N2O(HNO)(())※NO()※NO2-()※NO3-()。,N2、N2ONO。、NO、N2O,10%[7],MarshallSpectorN2O50%～80%[8]。,,,DO,SRT,N2O[9];,N2O[10]。N2O,。,,N2O,,。3.3　(),(DO、),,、。:,μm,。,,()。,、,,。,[11]。,,:DO、、、。,,,;,,。DO,,,。,,、、。,。,。,。,5%,、。,DO,,。,DO,(F/M)、。F/M、DO,。,F/M、DO,。—73—:,,,。4　,,DO。,,;,,,。[1]Hong.WZhao,DonaldsMavinic,etal.Controllingfactorsforsimultaneousnitrificationanddenitrificationinatwo-stageintermittentaerationprocesstreatingdomesticsewage.WaterResearch,1999,33(4):961～970.[2]Hyung.SeokYoo,etal.Nitrogenremovalfromsyntheticwastewaterbysimultaneousnitrificationanddenitrification(SND)vianitriteinaintermittently-aeratedreactor.WaterResearch,1999,33(1):145～154.[3]Randall.CW,BarnardJLandStenselHD.Designandretrofitofwastewatertreatmentplantsforbio-logicalnutrientremoval.WaterQualityManagementLibrary,Vol.5,TechnomicPublishingCompany,Inc,Lancaster,PA,1992.[4]Knowles.R.Denitrification.MicrobiologyReview,1982,(46):43～70.[5]Robertson.LA,vanNielEWJ,etal.SimultaneousnitrificationanddenitrificationinaerobicchemostatculturesofThiosphaerapantotropha.AppliedEnvironmentalMicrobiology,1988,54(1):2812～2818.[6]Van.NeilEWJ.Nitrificationbyheterotrophicdenitrifiersanditsrelationshiptoautotrophicnitrifica-tion.PhDThesis.DelftUniversityofTechnology,Delft,1991.[7]Hanaki.K,HongZAndMatsuoT.Productionofnitrousoxidegasduringdenitrificationofwastewater.WaterScienceandTechnology,1992,(26):1027.[8]Marshall.Spector.Productionanddecompositionofnitrousoxideduringbiologicaldenitrification.WaterEnvironRes,1998,(70):1096～1098.[9]ZhengHong,etal.Greenhousegas-N2Oproductionduringdenitrificationinwastewatertreatment.WatSaTech,1993,28(7):203～207.[10]Lloyd.HandKetchumJr.Designandphysicalfeaturesofsequencingbatchreactors.WaterScienceandTechnology,1997,35(1):11～18.[11]郑兴灿,李亚新编著.污水除磷脱氮技术[M].北京:中国建筑工业出版社,1998.—74—　20042